"I'd like the player to apologise and would encourage him to meet people with a learning disability so he can understand why the word is so damaging and offensive," Ciara Lawrence, who has a learning disability and is a campaigns support officer at Mencap, told the Press Association.

"Time and time again I hear this word used as if it has no effect. People clearly don't understand how upsetting and offensive this is to people with a learning disability like me.

"I am sick and tired of people in high-profile positions who are respected by the public using this word. It can make the public and people who look up to sports stars think it is okay to use words like this when it's not.

"It makes people with a learning disability seen not as people but as second-class citizens, and is no different to discriminating against someone who is gay or black."

Tomic has been plagued by off-court controversies during his career.

Most recently, he made headlines in Madrid when he turned his racquet the wrong way to face a match point against Fabio Fognini.

Tomic later told his post-match news conference: "I don't care about that match point. Would you care if you were 23 and worth over $10 million?"

In July last year, he was arrested in Miami after a wild party in a hotel penthouse suite.

He was dropped from the Davis Cup team and has since opted out of the Olympics.

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